先化简,再求值:
,其中
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3299a91b8aa437b4f45ac62e965c4b2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18c5a2a0320e34320db6055e31f0f8fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70a100443e47f3bd8ff48866627c5a7b.png)
更新时间:2020-06-25 21:14:34
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解答题-计算题
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较易
(0.85)
【推荐1】(1)计算:
.
(2)先化简代数式
,再从-2,-1,0,1,2中选一个适合的数代入求值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16cf14f578ca74a9e459c397cc38f1f.png)
(2)先化简代数式
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5b849890e2c1c98189ad9db8ac384e4.png)
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